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DUS4L suppresses invasion and metastasis in LUAD via modulation of PI3K/AKT and ERK/MAPK signaling through GRB2. | LitMetric
Objective : Limited research has focused on the role of dihydrouridine synthases (DUS) family members in human tumors. Our previous findings indicated an impact of dihydrouridine synthase 4 like (DUS4L) on cell proliferation and apoptosis in lung adenocarcinoma (LUAD) A549 cell, yet its broader functions and regulatory mechanisms in LUAD remain elusive.Methods : Using a LUAD tissue microarray and immunohistochemical (IHC) staining, we validated variations in DUS4L protein expression levels among LUAD patients and assessed its clinical significance. Additional experiments using short hairpin RNA (shRNA) against DUS4L (sh-DUS4L-2), LUAD cell lines, cell function assays (including wound healing, transwell migration and invasion, colony formation, and apoptosis assays), and mouse tumor xenografts were performed to examine the biological roles of DUS4L in LUAD progression. RNA sequencing, proteomic analyses, mass spectrometry, and co-immunoprecipitation experiments were conducted to identify and validate DUS4L-regulated downstream target genes and signaling pathways.Results : We identified a consistent upregulation of DUS4L in LUAD tissues. In vitro and in vivo experiments underscored the inhibitory effect of DUS4L downregulation on LUAD progression, including migration, invasion, and proliferation. Mechanistically, DUS4L was found to interact with the signaling molecule GRB2, promoting LUAD progression and metastasis by inducing epithelial-mesenchymal transition (EMT) via the PI3K/AKT and ERK/MAPK pathways.Conclusion : Our results establish the functional role of DUS4L in driving the progression and metastasis of LUAD, implicating its potential as a candidate therapeutic target for LUAD.
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